JP3039893U - Preheated ballast for fluorescent lamps - Google Patents

Abstract

(57) Abstract: A preheating type ballast for a fluorescent lamp device that employs a preheating system and can reduce the instantaneous current and voltage at the time of startup. SOLUTION: A transistor switching circuit 40 and a frequency generator 60 for applying preheating and generating a high frequency driving voltage required for lighting a fluorescent lamp, and a fluorescent lamp heating circuit 70 are main constituent elements. This fluorescent lamp heating circuit 70 is a short-circuit type fluorescent lamp heating system applying an electronic switch and a delay circuit, or an oscillation frequency changing type fluorescent lamp heating system including a circuit in which an electronic switch and a capacitor are connected in series or a high frequency. The voltage breakdown unit and the temperature switch are connected by any of the mechanical fluorescent lamp heating methods.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a fluorescent ballast technology, and more particularly to an electronic ballast circuit for lighting a fluorescent lamp by a preheating method.

[0002]

[Prior art]

 As a known method for lighting a fluorescent lamp, there is a method in which a high-frequency ballast or a transformer ballast is applied. Among them, the high-frequency ballast does not have the effect of preheating the fluorescent lamp, and the fluorescent lamp emits light at the same time as energizing by opening the switch. However, on the contrary, this causes a weakening phenomenon of the light beam of the fluorescent lamp, resulting in a shorter life.

On the other hand, the transformer ballast is a preheating type, and since the fluorescent lamp is preheated before being turned on, the light beam is not weakened and the life is extended. This preheating method is currently considered to be the most effective method in the industry to extend the life of fluorescent lamps.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned conventional transformer-based ballast requires a large instantaneous current and voltage at the time of startup because the fluorescent lamp is turned on by the starter. Therefore, the life of the fluorescent lamp is adversely affected.

The present invention was developed in view of the drawbacks of the above conventional means, and provides a novel preheating type ballast for lighting a fluorescent lamp by using a preheating system. With the goal.

Another object of the present invention is to provide a novel preheat type ballast that can reduce the instantaneous current and voltage when lighting a fluorescent lamp and extend the life of the fluorescent lamp.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a preheating type ballast for a fluorescent lamp device, and a high frequency driving voltage generating means for preheating a fluorescent lamp and generating a high frequency driving voltage for lighting the fluorescent lamp. A heating circuit including an electronic switch connected in parallel to both ends of the fluorescent lamp and a delay circuit connected to the electronic switch and controlling the open / closed state of the fluorescent switch. When input is applied to both ends of the lamp, both ends of the fluorescent lamp are short-circuited by the electronic switch, so that the fluorescent lamp cannot be turned on by the high frequency driving voltage, and at the same time, the fluorescent lamp is turned on by the high frequency driving voltage. Both ends of the fluorescent lamp are heated and preheated, and after a certain time delay, the delay circuit outputs a pulse signal and the electronic switch is opened, releasing the short circuit at both ends of the fluorescent lamp and Drive voltage Is input, characterized in that lighting the fluorescent lamp directly.

According to the above configuration, the electronic switch is connected in parallel to both ends of the fluorescent lamp, the delay circuit for controlling the open / closed state is connected to the electronic switch, and the high frequency drive voltage is applied to the fluorescent lamp. When it is input to both ends of the fluorescent lamp, both ends of the fluorescent lamp are short-circuited by the electronic switch, so that the fluorescent lamp cannot be lit by the high frequency driving voltage, and at the same time, the fluorescent lamp is heated and preheated. After a certain period of delay, the delay circuit outputs a pulse signal and the electronic switch is opened to release the short circuit at both ends of the fluorescent lamp, and the high frequency drive voltage is input to the fluorescent lamp. Light up directly.

It is also preferable that the electronic switch heats the fluorescent lamp by changing the oscillation frequency of the fluorescent lamp circuit.

It is also preferable that the electronic switch is adapted to heat the fluorescent lamp by applying a capacitor to change the oscillation frequency of the fluorescent lamp circuit.

Further, the present invention relates to a preheating type ballast for a fluorescent lamp device, which comprises high frequency driving voltage generating means for preheating the fluorescent lamp and generating a high frequency driving voltage for lighting the fluorescent lamp, and a temperature switch. And a high-voltage breakdown unit connected in series to the temperature switch, and a heating circuit connected in parallel to both ends of the fluorescent lamp, and a high frequency drive voltage is input to both ends of the fluorescent lamp. When the high-voltage breakdown unit breaks down, a short-circuit current is generated at both ends of the fluorescent lamp, making it impossible to turn on the fluorescent lamp. The short circuit by the voltage breakdown unit heats the temperature switch, the temperature switch breaks, and when the short-circuit action of the high voltage breakdown unit is lost, the fluorescent lamp is turned on by the high frequency drive voltage. You.

According to the above configuration, the temperature switch and the high voltage breakdown unit connected in series to the temperature switch are connected in parallel to both ends of the fluorescent lamp to form a heating circuit, and the high frequency drive voltage is When input is applied to both ends of the fluorescent lamp, the high-voltage breakdown unit breaks down, causing a short circuit at both ends of the fluorescent lamp, making it impossible to turn on the fluorescent lamp. When the action occurs and the short circuit by the high-voltage breakdown unit heats the fluorescent lamp, the temperature switch is released after a certain time delay, and the short-circuit action of the high-voltage breakdown unit is lost, and the fluorescent lamp is driven by the high frequency drive voltage. Is lit by.

[0013]

[Embodiment of the invention]

 The block diagram of FIG. 1 is a block diagram in which the fluorescent ballast of the present invention is applied to a circuit for lighting a fluorescent lamp FL. The block diagram includes an AC power supply 10, an RFI filter circuit 20, a full-wave rectifier 30, a transistor switching circuit 40, a coupling circuit 50, a frequency generator 60, and a fluorescent lamp heating circuit 70. It is configured. The AC power supply 10 is supplied as electric power necessary for lighting the fluorescent lamp FL, and is generally supplied from household electric power of 110V to 220V. The supplied electric power is supplied to the transistor switching circuit 40 after the surge current generated in the circuit is removed by the RFI filter circuit 20 and converted into a direct current by the full-wave rectifier 30. Further, the transistor switching circuit 40 is driven by a high frequency signal provided by the frequency generator 60, and converts the DC voltage into a high frequency drive voltage having a frequency of 40 KHz. This high frequency drive voltage causes the fluorescent lamp coupling circuit 50 to turn on the fluorescent lamp FL. In this case, the fluorescent lamp heating circuit 70 is installed near the coupling circuit 50, and when the fluorescent lamp FL is activated, the tungsten lamp is heated by the fluorescent lamp heating circuit 70, and then the coupling circuit 50 is further switched. Instead, the fluorescent lamp FL is turned on.

In the block diagram of the circuit configuration described above, the RFI filter circuit 20 and the full-wave rectifier 30 both belong to the well-known technology, and therefore their structures and effects will not be described in detail here.

The preheating type ballast for a fluorescent lamp device according to the present invention adopts a preheating method to preheat to a predetermined temperature and then turn on the fluorescent lamp. Different from The main feature of the preheat type ballast of the present invention is to preheat the fluorescent lamp FL by the novel fluorescent lamp heating circuit 70.

There are three types of implementation methods of the fluorescent lamp heating circuit 70: (1) short circuit method, (2) fluorescent lamp oscillation frequency changing method, and (3) mechanical method. Embodiments of these three types of methods will be described below with reference to the drawings.

Example 1. An embodiment of the short-circuit type fluorescent lamp heating circuit 70 will be described with reference to FIGS. 2 and 3.

FIG. 2 is a structural block diagram of the fluorescent lamp heating circuit 70, and FIG. 3 is a detailed circuit configuration diagram of the entire preheating type ballast of the fluorescent lamp device of the present invention. According to the disclosure of FIG. 2, the fluorescent lamp heating circuit 70 includes an electronic switch 71 and a delay circuit 72. The detailed circuit configuration is disclosed in the right side portion of the fluorescent lamp FL in FIG. The circuit on the left side of the fluorescent lamp FL is a detailed disclosure of a circuit configuration including an RF I filter circuit 20, a full-wave rectifier 30, a transistor switching circuit 40, a fluorescent lamp coupling circuit 50, and a frequency generator 60. is there. Since these parts belong to the well-known technology, they are only disclosed in the drawings for reference, and the detailed description of their effects is omitted.

According to the disclosure of FIG. 2, the electronic switch 71 that constitutes the fluorescent lamp heating circuit 70 is connected to both ends (a and b ends) of the fluorescent lamp FL. When the high frequency drive voltage is input to both ends of the fluorescent lamp FL, the fluorescent lamp FL is not turned on by the high frequency drive voltage because both ends thereof are short-circuited by the electronic switch 71. As a result, the tungsten on both ends of the fluorescent lamp FL is heated by the high frequency drive voltage, and a preheating action is given. Next, after a delay of some time, the delay circuit 72 outputs a pulse signal and the electronic switch 71 changes from the closed state to the open state. As a result, the short circuit at both ends of the fluorescent lamp FL is released, and a high-frequency drive voltage is input to the fluorescent lamp FL to light it.

As disclosed in FIG. 3, the electronic switch 71 is composed of a transistor T1 and a resistor R1. In the delay circuit 72 of the fluorescent lamp heating circuit 70, which includes elements other than the electronic switch 71, the diode D1 converts the AC resonance voltage across the fluorescent lamp FL into a half-wave rectified voltage. Further, the resistor R2 is a voltage drop resistor and converts the half-wave voltage into a DC voltage together with the Zener diode D2 and the capacitor C1. The resistor R4 constitutes a bias circuit of the transistor T2 together with the resistor R7, and the resistor R3 controls the charging speed of the transistor T2 with respect to the capacitor C2. The timer circuit formed by the capacitor C2 and the transistor T2 switches the work mode of the transistor T1.

When the voltage across the capacitor C2 is higher than the breakdown voltage of the Zener diode D3, the circuit composed of the resistors R5 and R6 and the capacitor C3 operates the transistor T3 to saturate the cutoff state. Shift to the state. As a result, the electronic switch 71 constituted by the transistor T1 and the resistor R1 is changed from the closed state to the open state, and the high frequency drive voltage is applied to both ends of the fluorescent lamp FL to light it.

Example 2. An embodiment of a fluorescent lamp heating circuit of an oscillation frequency changing system will be described with reference to FIGS.

In FIG. 4, the capacitor C11 is connected in series with the fluorescent lamp FL, and the capacitor C13 is connected in parallel with the fluorescent lamp FL. Further, the capacitor C12 is connected in series to the electronic switch 71, and the series connection between the capacitor C12 and the electronic switch 71 is connected in parallel to the fluorescent lamp FL, like the capacitor C13. The electronic switch 71 is connected to the delay circuit 72 as in the first embodiment. When a high frequency drive voltage is applied to this circuit with the electronic switch 71 closed, an oscillating frequency is generated in the circuit by the capacitors C11, C12, C13 and the inductance L. The frequency is the fluorescent lamp FL. Since the resonance frequency is different from the natural frequency, the fluorescent lamp FL is heated without being turned on. After a certain time, the delay circuit 72 operates and the electronic switch 71 is turned off. Then, the action of the capacitor C12 disappears, and the oscillation frequency is determined by the capacitors C11, C13 and the inductance L. Since this frequency is set in advance in accordance with the lighting frequency of the fluorescent lamp FL, the fluorescent lamp FL is turned on.

Further, FIG. 5 shows a modified example of the oscillation frequency changing type fluorescent lamp heating circuit. In FIG. 5, the capacitor C12 is connected in series to the fluorescent lamp FL together with the capacitor C11, and the electronic switch 71 is connected in parallel to the capacitor C12. When a voltage is applied with the electronic switch 71 closed, the capacitor C12 is bypassed and the oscillation frequency is determined by the capacitors C11 and C13 and the inductance L. Since the oscillation frequency in this case is preset so as to be different from the lighting frequency of the fluorescent lamp FL, the fluorescent lamp FL is heated without being lit. After a certain time, the delay circuit 72 operates, the electronic switch 71 is released, the capacity of the capacitor C12 is added to the oscillation circuit, the oscillation frequency matches the lighting frequency of the fluorescent lamp FL, and the fluorescent lamp is turned on.

Example 3. An embodiment of a mechanical fluorescent lamp heating circuit will be described with reference to FIG. FIG. 6 is a block diagram showing the circuit structure of a fluorescent ballast of the present invention using a mechanical type fluorescent lamp heating circuit. In this embodiment, a temperature switch 73 and a high voltage breakdown unit 74 are connected in series at both ends of the fluorescent lamp FL to form a mechanical fluorescent lamp heating circuit. The high voltage breakdown unit 74 includes a unit that breaks down by a high voltage such as a Zener diode or DIAC. When a high frequency drive voltage is input to both ends of the fluorescent lamp FL, the high voltage breakdown unit 74 cannot bear such a high voltage and breaks down, generating a short-circuit current at both ends of the fluorescent lamp FL. At this time, the fluorescent lamp FL cannot be turned on due to the short circuit of the high voltage breakdown unit 74, and therefore both ends of the fluorescent lamp FL are heated. Further, the short circuit current generated by the high voltage breakdown unit 74 heats the metal spring on the temperature switch 73, and after a certain amount of time elapses, the metal spring is removed by preheating and the temperature switch 73 is opened. Therefore, the short circuit of the high voltage breakdown unit 74 is eliminated. As a result, the high frequency drive voltage is applied to the fluorescent lamp FL and the fluorescent lamp FL is turned on. The temperature switch 73 is newly closed as the temperature drops. However, at that time, the fluorescent lamp FL is turned on by the high frequency drive voltage, and the voltage across the fluorescent lamp FL becomes lower than the breakdown voltage of the high-voltage breakdown unit 74, so that the high-voltage breakdown unit 74 breaks down. Instead, the fluorescent lamp FL continuously maintains the light emitting state.

The above description relates to an ideal embodiment of the present invention, and does not limit the scope of the present invention. Anything completed, changed, corrected, or modified within the spirit disclosed in the present invention shall fall under the scope of the claims of the present invention.

[0027]

[Effect of the invention]

 The preheating type ballast of the fluorescent lamp apparatus according to the present invention is a preheating type and is replaced with a conventional high frequency type ballast or transformer type ballast. Therefore, it is possible to prevent the light beam of the fluorescent lamp from being weakened and to maintain its life for a long time. Moreover, the life of the fluorescent lamp can be increased without any influence on the life of the fluorescent lamp due to the large instantaneous current at the time of startup. As a result, the stability of the fluorescent lamp can be improved and the energy efficiency can be improved. Therefore, it is a device suitable for environmental conservation.

[Brief description of the drawings]

FIG. 1 is a block diagram of a circuit configuration in which the fluorescent ballast of the present invention is applied to a circuit for lighting a fluorescent lamp.

FIG. 2 is a detailed circuit configuration diagram of the fluorescent lamp ballast of FIG.

FIG. 3 is an overall detailed circuit configuration diagram of a ballast for a fluorescent lamp of the present invention.

FIG. 4 is a block diagram of a circuit configuration in which an electronic switch and a capacitor are connected in series in an oscillation frequency changing type fluorescent lamp heating circuit.

FIG. 5 is a block diagram of a circuit configuration in which an electronic switch and a capacitor are connected in series in an oscillation frequency changing type fluorescent lamp heating circuit.

FIG. 6 is a block diagram of a circuit configuration in which the fluorescent lamp electronic ballast circuit of the present invention is applied to a mechanical fluorescent lamp heating circuit.

[Explanation of symbols]

10 AC power supply, 20 RFI filter circuit, 30
Full wave rectifier, 40 transistor switching circuit, 50 coupling circuit, 60 frequency generator, 70 fluorescent lamp heating circuit, 71 electronic switch, 72 delay circuit, 73 temperature switch, 74 high voltage breakdown unit, a, b fluorescent lamp end,
C1 to C2 capacitors, D1, D3 diodes, D
2 Zener diode, FL fluorescent lamp, R1 to R6
Resistors, T1-T3 transistors.

Claims (4)

[Utility model registration claims] 1. A preheating type ballast for a fluorescent lamp device, comprising: high frequency driving voltage generating means for preheating the fluorescent lamp and generating a high frequency driving voltage for lighting the fluorescent lamp; and connecting in parallel to both ends of the fluorescent lamp. And a heating circuit including an electronic switch connected to the electronic switch and a delay circuit connected to the electronic switch to control the open / closed state of the electronic switch. When a high frequency drive voltage is input to both ends of the fluorescent lamp, Both ends of the fluorescent lamp are short-circuited by the electronic switch, so that the fluorescent lamp cannot be turned on by the high frequency driving voltage, and at the same time, both ends of the fluorescent lamp are heated by the high frequency driving voltage to give a preheating effect, and the constant temperature is maintained. After the delay of the time, the delay circuit outputs a pulse signal and the electronic switch is opened to release the short circuit between both ends of the fluorescent lamp, and the high frequency drive voltage is input to the fluorescent lamp. Preheating ballast of a fluorescent lamp and wherein the to be lighted directly. 2. The preheat type ballast for a fluorescent lamp apparatus according to claim 1, wherein the electronic switch heats the fluorescent lamp by changing the oscillation frequency of the fluorescent lamp circuit. 3. The preheating of the fluorescent lamp apparatus according to claim 2, wherein the electronic switch heats the fluorescent lamp by applying a capacitor to change the oscillation frequency of the fluorescent lamp circuit. Ballast. 4. A preheating type ballast for a fluorescent lamp device, comprising: a high frequency driving voltage generating means for preheating a fluorescent lamp and generating a high frequency driving voltage for lighting the fluorescent lamp; a temperature switch; and the temperature switch. A high voltage breakdown unit connected in series to the fluorescent lamp, and a heating circuit connected in parallel to both ends of the fluorescent lamp, and, when a high frequency drive voltage is input to both ends of the fluorescent lamp, the high voltage When the breakdown unit breaks down, a short-circuit current is generated at both ends of the fluorescent lamp and it becomes impossible to light the fluorescent lamp.Therefore, a heating action occurs at both ends of the fluorescent lamp, and a short circuit due to the high-voltage breakdown unit causes a temperature rise. A preheat type safety device for a fluorescent light device, characterized in that when the switch is heated to break the temperature switch and the short-circuiting action of the high voltage breakdown unit is lost, the fluorescent light is turned on by the high frequency drive voltage. Vessel.